One would think that a son of a Presidential candidate would know that you don't take a firearm on a plane.
Why, he merely forgot that his daddy has not yet been elected...
.40 cal Glock with a spare mag. Sounds like he just came from the range.
But you can, just not in the carry on bags or on your person. All you have to do is unload it, unload the magazines and put the rounds in a box, preferably the original box, but I believe a plastic box made for the purpose will be OK as well. Then tell your airline about it.
I found myself out of town in Orlando, and discovered a box of .45 ACP (Remington Golden Sabers) in my duffel. I don't normally use that one when I fly, but do when I drive. However the trip was long, the weather cool, and thus I needed the larger piece of luggage as well as the smaller one, but didn't release I had not taken the ammo out of the duffel's pocket. Thus I traveled to Orlando with it in the bag, didn't declare it anything. On the return I declared it, they asked if was in the original packaging, it was, and that was that. Told the TSA folks it was in there as well.
I cold have just a well had the Witness or 1911 in there as well. I imagine it would have been a bit more dicey if it had been discovered before I'd declared it.